Chair-iron.



. 110.847.979'. PATENTED 111111.19, 1907.

' H. W. BoLBNs.

. CHAIR 1R0N.

PPPPPP ATION FILED NOV. 15,1905.

z SHEET nnnnnnn 1.

IIIIIIIIIIII- vNo 947,979.

H. W. BOLIEINS.

GHAIR IRON. l

APPLICATION FILED NOV-'15, 190.5.

@l/91mm!! 2 'PATENTED 199119.19, 1907.

1HE :vonnis purr-s co., wAsHlNwan, D. f:v

UNITED `STATES PATENT OFFICE.

CHAIR-IRON.

Specification of Letters Patent.

Patented March 19, 1907.

Application filed November 15,1905. Serial No. 287,442.

.0 al?, whom, t may concern.-

Be it known that I, HARRY W. BoLENs, a citizen of the United States, residing at Port Washington, in the county of Ozaukee and State of Wisconsin, have invented certain Improvements in Chair-Irons, of which the following is a specification.

This invention relates to improvements in chair-irons, the principal objects in view being to construct a chair-iron of sheet metal or stamped steel, thereby securing lightness, and at the same time to embody in such construction such an arrangement and disposition of the parts as to secure eXtreme rigidity, strength, and durability.

Other objects and advantages of the invention will hereinafter appear, and the novel features thereof will be particularly pointed out in the appended claims.

Referring to the drawings, Figure 1 is a side elevation of a chair-iron embodying my invention, Fig. 2 is a top plan view ofithe same. Fig. 3 is a central longitudinal section of the improved chair-iron; Fig. 4, a rear elevation of the same, the spider-arms being shown in cross-section. Fig. 5 is a view of a portion of the chair-iron, similar to Fig. 4, but illustrating the same in connection with a pressure-plate designed for a double-spring arrangement.

Like numerals of reference indicate like parts in all the figures of the drawings.

In practicing my invention I construct the yoke 1 of U shape and of sheet metal, and in order to do so I preferably employ an inner yoke-frame 2 and an outer yoke-frame 3, the latter inclosing the former and being riveted thereto, as at 4, near their upper ends. The lower horizontal cross-piece 5 of the inner yoke-frame 2 is spaced above the corresponding cross-piece 6 of the yoke-frame 3, and these two cross-pieces 5 and 6 are formed with vertically-alining openings 7, designed to receive the upper headed end 8 of the usual adjusting-screw or supporting-spindle 9. I may also employ in this connection a cylindrical spacing-collar 10, the same encircling the upper end of said screw or spindle and interposed between the cross-pieces 5 .and 6 of the yoke-frames 2 and 3. The upper end of the inner yoke-frame 2 may occur below the corresponding end of the outer yoke-frame 3, and the edge -of the former is preferably inclined from front to rear, as indicated in Fig. 3 by dotted lines, so as to produce a stopshonlder 11, operating in a manner hereinafter described. Spacing the distance between the yoke thus formed is the spreader 12, which comprises the sheet-metal spreader plate 13 and the integral depending sides or ears 14, which take between the aforesaid yoke 1 and at their lower ends are pvoted to said yoke by means of a transverse pintle 15, whereby there is produced what is commonly known as a low-fulcrum chair-iron. In order to stien the aforesaid spreader, I may stamp within the horizontal portion of the same a star-shaped or other figure 16, Whereby I am enabled to employ reasonably light material in the construction.

Mounted upon the described spreader are the opposite spider-arms 17, which are preferably made of angle-iron, so as to coincide with the angular corners of4 the spider.

'These spider-arms may be given any dispo- The bridge-piece for aiding in the support' of the tension device, and which I have indicated as 19, is formed of a strip of sheet metal 'of any desired width and is provided with downturned ends 20, which may be riveted to the ears 14 of the spreader, as at 21, and through the lower portions of said downturned ends the pintle 15 also passes, so that the latter serves as an additional means for securing the bridge-piece in position. If the style of chair-iron is that embodying but a single tension-spring 22, as shown in Figs. 1, 2, 3, and 4., then the aforesaid bridge-piece is at its middle provided with a single depending loop or depression 23; but if the style of chairiron embodies the twin arrangement of tension-springs then similar depressions or loops 23 (see Fig. 5) are employed, the loops being arranged at opposite sides of the center. In either instance, however, I prefer to cut away the lower front corners of the looped or depressed portions of the bridge-piece, as indicated by 24, so as to embrace partially and rest upon the transverse pintle 15, whereby, as will be obvious from Fig. 3, the said pintle forms a support for the lower end of the bridge-piece and intermediate its points of IOO IlO

connection with the spreader, which point, as will be well known, is subjected to the greatest strain from the compression-springs.

As a support for the iront end of the tension-rod 25 I may form integral or otherwise with preferably the yoke-trame 3 an otiset cross-piece 26, the same having an opening 27 for the reception of the aforesaid tensionrod. This rod of course will be provided with the usual bearing-collar 23 and handwheel 29 at its front end, the two compressionplates 30 and 31, and the spring or springs 22. The inner compression-plate 31 may be provided with the usual transverse rib 32, (see dotted lines, Fig. 3,) which engage with notches 33, termed in the rear edges of the bridge-piece it). As seen in Fig. 5, where the chair-iron is adapted for the doublespring tension, the inner compression-plate 34 is elongated and may be supported at any desired number of points. As will also be seen by said iigure, in such instance the tension-rod 25 instead of passing through the loop 23 passes between the same. sult, however, is the same and the two constructions very similar, inasmuch as one is z, mere duplication of the parts of the other.

The operation of the invention will be readily understood from the foregoing detailed description and need not be particularly referred to. Furthermore, the advantages arising from a chair-iron constructed wholly ot sheet metal or stamped steel will be at once appreciated, as will also the strength ot the completed article when the disposition of the various parts and their arrangement relative to each other is considered.

Various changes ot a minor character may be made without departing from the spirit ot my invention, and it will be obvious that such changes as will adapt the chair-iron to the high-fulcrum style in lieu ot the lowfulcrum style herein illustrated will readily suggest themselves to those skilled in this class ot inventions.

Having thus described my invention, I claiml. The combination, in a chair-iron, comprising a spreader, of a yoke for supporting the same, said yoke comprising a pair of U- shaped sheet-metal yoke-frames arranged one within the other and with their lower cross-bars spaced apart and having alining holes, and a spacing-sleeve intermediate the cross-b ars and surrounding said holes.

2. The combination, in a chair-iron, cemprising a spreader, of a yoke for pivotally supporting the same, the yoke comprising two U-shaped sheet-metal yoke-trames, the upper terminals of the inner frame being inclined to Jform stops against which projections on the spreader are adapted to abut.

3. The combination, in a chair-iron, of a yoke, comprising two substantially U-shaped The re- )oke-trames of diti'erent lengths arranged. the shorter within the longer and having their lower transverse portions spaced apart and adapted to receive the, upper end ot the supporting-post and. their vertical portions riveted together, the upper ends of said inner yoke-:trame terminating short ot those ol` the outer Ytraine and constituting stops, and a spreader pivotedbetween the terminals olt the yoke and extending above the stops and adaptedwhen tilt ed to abu t against the same.

l. The combination, in a chair-inni, ot a spreader, projections upon its sides, a pair ol' U-shaped sheet-metal yoke-.trainers mounted one within the other to torni a yoke, one oll said 'frames provided at the upper edges with shoulders to coact with said project ions, whereby the tilting et the spreader is limited, and a pivoting means between the yoke, and spreader.

5. The combination, in a chair-iron, ol' a sheet-metal spreader-plate having depending sides, a U-shaped sheet-metal yoke coniprising two U-shaped yoke-.l'rame,s, said yoke embracing the depending sides ott the spreader-plate, the upper ends ol the terminals ot the inner yoke-trarne being inclined to torni stop-shoulders, a pintlel passing through the two yoke-trames and depending sides of the spreader, and. angular spiderarins mounted on. the spreader and ,having their vertical ilanges adapted to abut against said stop-shoulders. V

6. The combination, in a chair-iron, oti a spreader, a supporti11g-yoke, a pintle connecting the two, and a tension-support bearinfT against the pintle whereby it is braced.

f. The combination, in a chair-iron, ol a spreader, a supporting-yoko, a pintle connecting the two, and a tension-support haying an intermediate depending portion bearing against and supported by the pintle.

S. The combination, in a chair-iron, oll a spreader, a supperting-yoke, a pintle oonnecting the two, and a tension-support having a depending intermediate portion eut away at its lower end to receive and bear against said pintle.

9. The combination, in a chair-iron, ot a transverse sheet-metal tension-support supported within the iron and provided with an intermeeiate bent portion, the conipressionplate of the tension device bearing against the edges thereof, and the tension-rodpassing through said bent portion ot said support.

10. The combination, in a chair-iron, of an inverted-U-shaped spreader, a U-shaped yoke embracing the sam and having at one side a support 'for one end oi the tension device, a transverse sheet-1n et al tension-s1ipport having its ends riveted to the depending sides et the spreader, and between its ends shaped to receive the tension-rod and. 'form a support for the compression-plate thereof.

IOO

ISO

11. The combination, in a chair-iron, of a U-shaped yoke having the front cross-piece connecting its terminals, a U-shaped spreader pivotally mounted between said terminals, the transverse tension-support having its terminals bent and secured to the opposite depending sides of the spreader and between its ends depressed, as at 23, and notched, and the tension device having its rod passed through said tension-support and cross-piece and its inner compression-plate ribbed and engaging the notches of the transverse tension-support.

12. The combination, in a chair-iron, of a front cross-piece supported by the yoke, a

rear transverse tension-support supported by the spreader and having a pair of depending loops, a tension device of the twospring variety having its tension-rod supported by the cross-piece and passed between the loops, and its inner compression-plate bearing against the rear` edges of the loops and supported thereby.

In testimony whereor1 I have signed my name to this specification in the presence of two subscribing witnesses.

` HARRY W. BOLENS. Witnesses:

' AUG. BoERG-ER,

EDWARD BARELMAN. 

